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References
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Wells
G. M.
‘The Need and Scope for Automation at Coal Mines’ . Trans. Soc. of Instrument Technology : Vol. 18 : No. 3 (Sep. 1966 ).
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Martin
D. J. R.
‘Remote Control at the Coalface’ . Trans. Soc. of Instrument Technology : Vol. 18 : No. 3 (Sep. 1966 ).